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Related Experiment Video

Updated: Dec 18, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

Negative photoconductivity in Cs₄PbBr₆ single crystal.

Ye Yuan¹, Qing Yao, Jie Zhang

¹College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China. dingjianxu@sdust.edu.cn.

Physical Chemistry Chemical Physics : PCCP

|June 20, 2020

Summary

Negative photoconductivity was observed in cesium lead bromide (Cs4PbBr6) inorganic perovskites. This phenomenon is attributed to charged excitons and bromine vacancies, offering new insights into Cs4PbBr6 photophysics.

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Area of Science:

Materials Science
Solid-State Physics
Photophysics

Background:

Zero-dimensional (0D) inorganic perovskites like Cs4PbBr6 exhibit high photoluminescence (PL) efficiency and color purity.
The precise origin of PL and photophysics in Cs4PbBr6 remains debated.
Understanding carrier dynamics and ion migration is key to elucidating its properties.

Purpose of the Study:

To investigate the photophysics of Cs4PbBr6 single crystals.
To explore the role of mobile ions in photo-excited carrier behavior.
To understand the origin of negative photoconductivity in Cs4PbBr6.

Main Methods:

Growth of high-purity Cs4PbBr6 single crystals from Cs-enriched solutions.
Fabrication of Au-crystal-Au photoconductivity devices.
Measurement of photocurrents under varying illumination power.

Main Results:

Negative photoconductivity was observed for the first time in Cs4PbBr6.
Photocurrent behavior under high illumination resembled diode characteristics.
A built-in electric field from charged excitons and bromine vacancies (VBr+) was proposed as the cause.

Conclusions:

The study provides a novel explanation for negative photoconductivity in Cs4PbBr6.
Charged excitons and bromine vacancies play a significant role in the material's photophysics.
This finding advances the understanding of inorganic perovskite optoelectronic properties.